/Engine/Source/Editor/UnrealEd/Public/FileHelpers.h
Overloaded version of PromptToCheckOutLevels which prompts the user with a check-box dialog allowing them to check out the relevant level package if necessary
true if the user did not cancel out of the dialog and has potentially checked out some files (or if there is no source control integration); false if the user cancelled the dialog
static bool PromptToCheckoutLevels ( bool bCheckDirty, [ULevel](API\Runtime\Engine\Engine\ULevel) * SpecificLevelToCheckOut )